Alan Redpath, former pastor at Moody Memorial Church in Chicago (1953-1962), recommended that we give ourselves a "think before you speak" test by asking ourselves five questions:
T: "Is it True?"
H: "Is it Helpful?"
I: "Is it Inspiring?"
N: "Is it Necessary?"
K: "Is it Kind?"
If what we're about to say doesn't pass this test, it's best to keep quiet.
The heart of the righteous studies how to answer, but the mouth of the wicked pours forth evil. - Proverbs 15:28 KJV